Metal-casting device.



C. F. HANSEN.

METAL CASTING DEVICE.

APPLICATION FILED J'AN.6,191I

Patented 0ct.13,1914.

z 0 t m Q u t ad --T o all whom it may concern.

i ii i TED jsrAT s PATENT OFFICE.

CHRISTIAN r, Hansen, or NORFOLK, NEBRASKA.

' JtlETA'L-CASTII TQ DEVIE.

Be it known-that lfGfims'rrAri F. HAN- s'n1v, a citizen of the United 'States, and a MetaLCasting Devices, lowing 1S a specificatlon.

lays and the like within melting wax' patterns which have been in-- producing. perfect castings,

resident of Norfolk,- in the county of Madison and State of Nebraska, have invented certain new and useful- Improvements in of which 'the fol- This invention relates to metal-casting devices. and more; particularly to devices of I this class employed for 'casting .dental inmolds produced by closed Within investment cement.

In the practice .of dentistry much difliculty has heretofore. been experienced in due to the presence of air within the molds and the tendency. of the molten metal to assume beadlike forms, which factors prevent the metal fromcompletely filling .the crevices and sharply-angled depressions of the cavity.

Various methods and means have been gpresented whichemploy either vacuum or centrifugal force to introduce the metal into the mold. These means, however, are unreliable and cannot be depended upon to obviate the above-recited defects in casting.

'The present invention has, therefore, for

its primarybbject the production of an improved means for castingmetal.

.nother object of the invention is the production of a thoroughly reliable device ofthis class employing both vacuum and centrifugal force. a v I Another object is the construction of a device of. this class thoroughly eflicient in operation yet inexpensive in production.

s With these and other objects in view, the invention, consisting in the construction, combination and novel arrangement of parts, .will' be fully understood from the following description, to the accompanying a part of this application and in which like characters of reference indicate correspondinlg parts throughout. the everal views,i'of w 1c v v Figure 1 is a front elevation of a device constructed in accordance-with my invention; Fig. 2 is an enlarged longitudinal section of a portion of the. mold-supporting arm and members associated therewith; Fig. 3 is a longitudinal section reference being bad Specification of Lettersiatent. Application filed anuar -e, 191 4. Serial No.

' air 'may be withdrawn drawings, which form and of the vacuum drum; and Fig. 4: is a transverse section of the same.

Patented Oct. 13, 1914.

.Although I have illustrated and herein described. the preferred embodiment of my invention, I would not be understood as being limited to the specific structure chosen for illustration,

for without departing from the sp1rit and scope ofthe invention, various modifications and alterations of the arrange I ment of parts may be made.

The invention contemplates, broadly, 'a devicev embodying a rotatable mold-carrying member, a vacuum chamber, means for rotating said mold-carrying member whereby the metal is thrown into the, mold by centrifugal force, and means for exposing the mold to the vacuum coincident with the rotation of the mold-carrying member where-' by the air is withdrawn from the mold cavity and the vacuum coacts with centrifugal force in introducing the metal into the cavity, all of which will presently be made clear.

Referring, now, to the illustrations, 5 is a standard having a flat base and upwardlyextending arms, 6, between whichis mounted a drum, 7, which serves as the vacuum chamber and iscarried by shafts, 8 and 9, journaled in bearings, 10, mounted upon the upper ends of the supporting arms. The shaft 9 is preferably hollow, communicates with the interior of the chamber and carries upon its outer end a valve, 11', adapted for connection with a pump whereby the from the chamber.

the drum (respectmounted a vacuum The peripheral wall of the drum Upon the upper face of mg normal position) is gage, 12.

is preferably thicker on one side to counterbalance the weight of the members normally depending from the opposite side, as will later appear.

13 is an arm .carried by the drum and having an axial-bore, 14, which communicates at all times with the interior of the drum. Adjacent the outer end of the arm,

with, is a cup, 15, adapted to carry the mold. 4

Inpractiee the pattern is surrounded by a rather pervious investment, represented at 16 and inclosed by an open-ended casing, 17, having walls slig tly flared'to coact with the similarly-shaped inner periphery'of the preferably formed integrally there-' cup and thus make A minute passage,

bore, 26, positioned an air-tight connection. 18, communicates be tween the mold cavity, 19, and a conical depression, 20, in which the gold, or other metal, is to be melted.

It is essential that the cup have valvecontrolled communication withthe vacuum, and for this purpose I reduce and thread the outer end of thearm to receive a valve casing, 21, inclosing a valve, 22, having an angled stem, 23, encircled by a cap, 24, threaded upon the valve casing. The valve has an axial bore, 25, communicating with the bore i l and intersected by a horizontal to register with a tube, 27, interconnecting the mold receptacle and the valve casing. "The drum 7 is rotated rapidly by any suitable means, as the pinion, 28, secured upon the shaft 8 and inter-- meshedwith a relatively large spur-wheel, '29, having a handle, 30, and mounted'for 1 rotation upon a spindle, 31, extending from the standard.

To operate, the device nowdisclosed, .a vacuum having been first created, the gold," or othermineral, is placed in the depression and heat applied thereto. When the gold is thoroughly melted the drum is rotated rapidly whereupon the angled portion of the valve-stem will be engaged by a fixed member, as the stud, 32, and thus cause the valve port 26 to. register with the passage 27 whereby the mold cavity' will be exposed to the vacuum.

Having thus described my invention,- What I claim as new and desire to secure by Letters Patent of the United States, is,-

1. A device of the class described comprising a supporting means; a vacuum chamber; a rotatable element mounted upon said supporting means; a mold-carrying part carried by and disposed laterally to the r0 tatable element; a passage between the moldcarrying part and 'the vacuum chamber; means for actuating said rotatable element; and a valve for controlling said passage, said valve being opened automatically coincidentally with the actuation of said rotatable element, Y

2. A device of the class described comprising a supporting means; a vacuum chamber. rotatably -mounted thereon; a mold-carrying part carried by said vacuum chamber; a passage between said chamber and mold-carrying part; means for rotating said chamber whereby the metal will be thrown into the mold by centrifugal force; and a valve for the control of said passage, said valve being opened automatically coinvalve carried by the I h passage and means adapted for engage- 4 opened coincident with controlled passage between cidentally with the rotation of the vacuum chamber.

3. A device of. the class described cox n1" prising. a supporting means; .a .drum ro-fl tatably-mounted thereon; means for c'reat- .ing a vacuum within the drum; a'moldcarrying part carried by the drum; avalvecontrolled passage between the drum and mold-carrying part; and means for rotating the drum and thereby causing the molten metal to be thrown intojthe mold cavity by.

centrifugal force.

4:. A device of the class described com-'- prising a supporting means; a vacuum drum rotatablymounted rying part carried by the driun; means for rotating the drum; drum and mold-carrying for. controlling said passage; and means for automatically opening said valve governed by rotation of the drum. Y

.- 5. In a metal-casting device, a superstructu're having avacuum drum rotatably mountr thereon; a mold-cara passage between the member; a valve ed thereon and means for rotating the drum; a radial arm carried by the drum and having.

a bore communicating with the drum: a

mold-carrying cup carried. by the arm: a

passage between said bore and cup: and a arm for controlling said ment with the walve whereby the valve is' means for rotating the drum.

6. In a metal-casting device, a vacuum chamber; a rotatable element; a hollow arm carried thereby and disposed radially thereto, said arm communicating at all times with said vacuum chamber; a mold-rece ving part'carried by said arm and a valvesaid arm' and mold-receiving part. I

the actuation of said 7. A vacuum .chamber, a rotatable memher and means for'actuating said member,

in combination with anarm carried by and disposed radially to said member; a moldreceiving part carried by said arm; a passage between said vacuum chamber and mold receiving part; trol of said passage; and means for automatically opening said valve coincidentally with the actuation of said rotatable member.. a w 3 In testimony whereof I have hereunto set my hand in presence of two witnesses.

"ciiiiis'rii u F. HANSEN. I Witnesses: I

P. L. Zunnow, HENRY Morin.

a valve. for the con- 

